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mandos
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#!/usr/bin/python
2
2
# -*- mode: python; coding: utf-8 -*-
3
 
 
4
 
from __future__ import division
5
 
 
6
 
import SocketServer
 
3
# 
 
4
# Mandos server - give out binary blobs to connecting clients.
 
5
# 
 
6
# This program is partly derived from an example program for an Avahi
 
7
# service publisher, downloaded from
 
8
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
 
9
# methods "add", "remove", "server_state_changed",
 
10
# "entry_group_state_changed", "cleanup", and "activate" in the
 
11
# "AvahiService" class, and some lines in "main".
 
12
# 
 
13
# Everything else is
 
14
# Copyright © 2008,2009 Teddy Hogeborn
 
15
# Copyright © 2008,2009 Björn Påhlsson
 
16
# 
 
17
# This program is free software: you can redistribute it and/or modify
 
18
# it under the terms of the GNU General Public License as published by
 
19
# the Free Software Foundation, either version 3 of the License, or
 
20
# (at your option) any later version.
 
21
#
 
22
#     This program is distributed in the hope that it will be useful,
 
23
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
 
24
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
25
#     GNU General Public License for more details.
 
26
# 
 
27
# You should have received a copy of the GNU General Public License
 
28
# along with this program.  If not, see
 
29
# <http://www.gnu.org/licenses/>.
 
30
# 
 
31
# Contact the authors at <mandos@fukt.bsnet.se>.
 
32
# 
 
33
 
 
34
from __future__ import division, with_statement, absolute_import
 
35
 
 
36
import SocketServer as socketserver
7
37
import socket
8
 
import select
9
 
from optparse import OptionParser
 
38
import optparse
10
39
import datetime
11
40
import errno
12
41
import gnutls.crypto
15
44
import gnutls.library.functions
16
45
import gnutls.library.constants
17
46
import gnutls.library.types
18
 
import ConfigParser
 
47
import ConfigParser as configparser
19
48
import sys
20
49
import re
21
50
import os
22
51
import signal
23
 
from sets import Set
24
52
import subprocess
25
53
import atexit
26
54
import stat
 
55
import logging
 
56
import logging.handlers
 
57
import pwd
 
58
from contextlib import closing
 
59
import struct
 
60
import fcntl
 
61
import functools
27
62
 
28
63
import dbus
 
64
import dbus.service
29
65
import gobject
30
66
import avahi
31
67
from dbus.mainloop.glib import DBusGMainLoop
32
68
import ctypes
33
 
 
34
 
import logging
35
 
import logging.handlers
36
 
 
37
 
logger = logging.Logger('mandos')
38
 
syslogger = logging.handlers.SysLogHandler\
39
 
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON)
40
 
syslogger.setFormatter(logging.Formatter\
41
 
                        ('%(levelname)s: %(message)s'))
 
69
import ctypes.util
 
70
 
 
71
try:
 
72
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
 
73
except AttributeError:
 
74
    try:
 
75
        from IN import SO_BINDTODEVICE
 
76
    except ImportError:
 
77
        SO_BINDTODEVICE = None
 
78
 
 
79
 
 
80
version = "1.0.11"
 
81
 
 
82
logger = logging.Logger(u'mandos')
 
83
syslogger = (logging.handlers.SysLogHandler
 
84
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
 
85
              address = "/dev/log"))
 
86
syslogger.setFormatter(logging.Formatter
 
87
                       (u'Mandos [%(process)d]: %(levelname)s:'
 
88
                        u' %(message)s'))
42
89
logger.addHandler(syslogger)
43
 
del syslogger
44
 
 
45
 
# This variable is used to optionally bind to a specified interface.
46
 
# It is a global variable to fit in with the other variables from the
47
 
# Avahi server example code.
48
 
serviceInterface = avahi.IF_UNSPEC
49
 
# From the Avahi server example code:
50
 
serviceName = "Mandos"
51
 
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
52
 
servicePort = None                      # Not known at startup
53
 
serviceTXT = []                         # TXT record for the service
54
 
domain = ""                  # Domain to publish on, default to .local
55
 
host = ""          # Host to publish records for, default to localhost
56
 
group = None #our entry group
57
 
rename_count = 12       # Counter so we only rename after collisions a
58
 
                        # sensible number of times
59
 
# End of Avahi example code
 
90
 
 
91
console = logging.StreamHandler()
 
92
console.setFormatter(logging.Formatter(u'%(name)s [%(process)d]:'
 
93
                                       u' %(levelname)s:'
 
94
                                       u' %(message)s'))
 
95
logger.addHandler(console)
 
96
 
 
97
class AvahiError(Exception):
 
98
    def __init__(self, value, *args, **kwargs):
 
99
        self.value = value
 
100
        super(AvahiError, self).__init__(value, *args, **kwargs)
 
101
    def __unicode__(self):
 
102
        return unicode(repr(self.value))
 
103
 
 
104
class AvahiServiceError(AvahiError):
 
105
    pass
 
106
 
 
107
class AvahiGroupError(AvahiError):
 
108
    pass
 
109
 
 
110
 
 
111
class AvahiService(object):
 
112
    """An Avahi (Zeroconf) service.
 
113
    
 
114
    Attributes:
 
115
    interface: integer; avahi.IF_UNSPEC or an interface index.
 
116
               Used to optionally bind to the specified interface.
 
117
    name: string; Example: u'Mandos'
 
118
    type: string; Example: u'_mandos._tcp'.
 
119
                  See <http://www.dns-sd.org/ServiceTypes.html>
 
120
    port: integer; what port to announce
 
121
    TXT: list of strings; TXT record for the service
 
122
    domain: string; Domain to publish on, default to .local if empty.
 
123
    host: string; Host to publish records for, default is localhost
 
124
    max_renames: integer; maximum number of renames
 
125
    rename_count: integer; counter so we only rename after collisions
 
126
                  a sensible number of times
 
127
    group: D-Bus Entry Group
 
128
    server: D-Bus Server
 
129
    bus: dbus.SystemBus()
 
130
    """
 
131
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
 
132
                 servicetype = None, port = None, TXT = None,
 
133
                 domain = u"", host = u"", max_renames = 32768,
 
134
                 protocol = avahi.PROTO_UNSPEC, bus = None):
 
135
        self.interface = interface
 
136
        self.name = name
 
137
        self.type = servicetype
 
138
        self.port = port
 
139
        self.TXT = TXT if TXT is not None else []
 
140
        self.domain = domain
 
141
        self.host = host
 
142
        self.rename_count = 0
 
143
        self.max_renames = max_renames
 
144
        self.protocol = protocol
 
145
        self.group = None       # our entry group
 
146
        self.server = None
 
147
        self.bus = bus
 
148
    def rename(self):
 
149
        """Derived from the Avahi example code"""
 
150
        if self.rename_count >= self.max_renames:
 
151
            logger.critical(u"No suitable Zeroconf service name found"
 
152
                            u" after %i retries, exiting.",
 
153
                            self.rename_count)
 
154
            raise AvahiServiceError(u"Too many renames")
 
155
        self.name = self.server.GetAlternativeServiceName(self.name)
 
156
        logger.info(u"Changing Zeroconf service name to %r ...",
 
157
                    unicode(self.name))
 
158
        syslogger.setFormatter(logging.Formatter
 
159
                               (u'Mandos (%s) [%%(process)d]:'
 
160
                                u' %%(levelname)s: %%(message)s'
 
161
                                % self.name))
 
162
        self.remove()
 
163
        self.add()
 
164
        self.rename_count += 1
 
165
    def remove(self):
 
166
        """Derived from the Avahi example code"""
 
167
        if self.group is not None:
 
168
            self.group.Reset()
 
169
    def add(self):
 
170
        """Derived from the Avahi example code"""
 
171
        if self.group is None:
 
172
            self.group = dbus.Interface(
 
173
                self.bus.get_object(avahi.DBUS_NAME,
 
174
                                    self.server.EntryGroupNew()),
 
175
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
176
            self.group.connect_to_signal('StateChanged',
 
177
                                         self.entry_group_state_changed)
 
178
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
 
179
                     self.name, self.type)
 
180
        self.group.AddService(
 
181
            self.interface,
 
182
            self.protocol,
 
183
            dbus.UInt32(0),     # flags
 
184
            self.name, self.type,
 
185
            self.domain, self.host,
 
186
            dbus.UInt16(self.port),
 
187
            avahi.string_array_to_txt_array(self.TXT))
 
188
        self.group.Commit()
 
189
    def entry_group_state_changed(self, state, error):
 
190
        """Derived from the Avahi example code"""
 
191
        logger.debug(u"Avahi state change: %i", state)
 
192
        
 
193
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
194
            logger.debug(u"Zeroconf service established.")
 
195
        elif state == avahi.ENTRY_GROUP_COLLISION:
 
196
            logger.warning(u"Zeroconf service name collision.")
 
197
            self.rename()
 
198
        elif state == avahi.ENTRY_GROUP_FAILURE:
 
199
            logger.critical(u"Avahi: Error in group state changed %s",
 
200
                            unicode(error))
 
201
            raise AvahiGroupError(u"State changed: %s"
 
202
                                  % unicode(error))
 
203
    def cleanup(self):
 
204
        """Derived from the Avahi example code"""
 
205
        if self.group is not None:
 
206
            self.group.Free()
 
207
            self.group = None
 
208
    def server_state_changed(self, state):
 
209
        """Derived from the Avahi example code"""
 
210
        if state == avahi.SERVER_COLLISION:
 
211
            logger.error(u"Zeroconf server name collision")
 
212
            self.remove()
 
213
        elif state == avahi.SERVER_RUNNING:
 
214
            self.add()
 
215
    def activate(self):
 
216
        """Derived from the Avahi example code"""
 
217
        if self.server is None:
 
218
            self.server = dbus.Interface(
 
219
                self.bus.get_object(avahi.DBUS_NAME,
 
220
                                    avahi.DBUS_PATH_SERVER),
 
221
                avahi.DBUS_INTERFACE_SERVER)
 
222
        self.server.connect_to_signal(u"StateChanged",
 
223
                                 self.server_state_changed)
 
224
        self.server_state_changed(self.server.GetState())
60
225
 
61
226
 
62
227
class Client(object):
63
228
    """A representation of a client host served by this server.
 
229
    
64
230
    Attributes:
65
 
    name:      string; from the config file, used in log messages
 
231
    name:       string; from the config file, used in log messages and
 
232
                        D-Bus identifiers
66
233
    fingerprint: string (40 or 32 hexadecimal digits); used to
67
234
                 uniquely identify the client
68
 
    secret:    bytestring; sent verbatim (over TLS) to client
69
 
    fqdn:      string (FQDN); available for use by the checker command
70
 
    created:   datetime.datetime()
71
 
    last_seen: datetime.datetime() or None if not yet seen
72
 
    timeout:   datetime.timedelta(); How long from last_seen until
73
 
                                     this client is invalid
74
 
    interval:  datetime.timedelta(); How often to start a new checker
75
 
    stop_hook: If set, called by stop() as stop_hook(self)
76
 
    checker:   subprocess.Popen(); a running checker process used
77
 
                                   to see if the client lives.
78
 
                                   Is None if no process is running.
 
235
    secret:     bytestring; sent verbatim (over TLS) to client
 
236
    host:       string; available for use by the checker command
 
237
    created:    datetime.datetime(); (UTC) object creation
 
238
    last_enabled: datetime.datetime(); (UTC)
 
239
    enabled:    bool()
 
240
    last_checked_ok: datetime.datetime(); (UTC) or None
 
241
    timeout:    datetime.timedelta(); How long from last_checked_ok
 
242
                                      until this client is invalid
 
243
    interval:   datetime.timedelta(); How often to start a new checker
 
244
    disable_hook:  If set, called by disable() as disable_hook(self)
 
245
    checker:    subprocess.Popen(); a running checker process used
 
246
                                    to see if the client lives.
 
247
                                    'None' if no process is running.
79
248
    checker_initiator_tag: a gobject event source tag, or None
80
 
    stop_initiator_tag:    - '' -
 
249
    disable_initiator_tag:    - '' -
81
250
    checker_callback_tag:  - '' -
82
251
    checker_command: string; External command which is run to check if
83
 
                     client lives.  %()s expansions are done at
 
252
                     client lives.  %() expansions are done at
84
253
                     runtime with vars(self) as dict, so that for
85
254
                     instance %(name)s can be used in the command.
86
 
    Private attibutes:
87
 
    _timeout: Real variable for 'timeout'
88
 
    _interval: Real variable for 'interval'
89
 
    _timeout_milliseconds: Used by gobject.timeout_add()
90
 
    _interval_milliseconds: - '' -
 
255
    current_checker_command: string; current running checker_command
91
256
    """
92
 
    def _set_timeout(self, timeout):
93
 
        "Setter function for 'timeout' attribute"
94
 
        self._timeout = timeout
95
 
        self._timeout_milliseconds = ((self.timeout.days
96
 
                                       * 24 * 60 * 60 * 1000)
97
 
                                      + (self.timeout.seconds * 1000)
98
 
                                      + (self.timeout.microseconds
99
 
                                         // 1000))
100
 
    timeout = property(lambda self: self._timeout,
101
 
                       _set_timeout)
102
 
    del _set_timeout
103
 
    def _set_interval(self, interval):
104
 
        "Setter function for 'interval' attribute"
105
 
        self._interval = interval
106
 
        self._interval_milliseconds = ((self.interval.days
107
 
                                        * 24 * 60 * 60 * 1000)
108
 
                                       + (self.interval.seconds
109
 
                                          * 1000)
110
 
                                       + (self.interval.microseconds
111
 
                                          // 1000))
112
 
    interval = property(lambda self: self._interval,
113
 
                        _set_interval)
114
 
    del _set_interval
115
 
    def __init__(self, name=None, options=None, stop_hook=None,
116
 
                 fingerprint=None, secret=None, secfile=None,
117
 
                 fqdn=None, timeout=None, interval=-1, checker=None):
 
257
    
 
258
    @staticmethod
 
259
    def _datetime_to_milliseconds(dt):
 
260
        "Convert a datetime.datetime() to milliseconds"
 
261
        return ((dt.days * 24 * 60 * 60 * 1000)
 
262
                + (dt.seconds * 1000)
 
263
                + (dt.microseconds // 1000))
 
264
    
 
265
    def timeout_milliseconds(self):
 
266
        "Return the 'timeout' attribute in milliseconds"
 
267
        return self._datetime_to_milliseconds(self.timeout)
 
268
    
 
269
    def interval_milliseconds(self):
 
270
        "Return the 'interval' attribute in milliseconds"
 
271
        return self._datetime_to_milliseconds(self.interval)
 
272
    
 
273
    def __init__(self, name = None, disable_hook=None, config=None):
 
274
        """Note: the 'checker' key in 'config' sets the
 
275
        'checker_command' attribute and *not* the 'checker'
 
276
        attribute."""
118
277
        self.name = name
119
 
        # Uppercase and remove spaces from fingerprint
120
 
        # for later comparison purposes with return value of
121
 
        # the fingerprint() function
122
 
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
123
 
        if secret:
124
 
            self.secret = secret.decode(u"base64")
125
 
        elif secfile:
126
 
            sf = open(secfile)
127
 
            self.secret = sf.read()
128
 
            sf.close()
129
 
        else:
130
 
            raise RuntimeError(u"No secret or secfile for client %s"
131
 
                               % self.name)
132
 
        self.fqdn = fqdn                # string
133
 
        self.created = datetime.datetime.now()
134
 
        self.last_seen = None
135
 
        if timeout is None:
136
 
            self.timeout = options.timeout
137
 
        else:
138
 
            self.timeout = string_to_delta(timeout)
139
 
        if interval == -1:
140
 
            self.interval = options.interval
141
 
        else:
142
 
            self.interval = string_to_delta(interval)
143
 
        self.stop_hook = stop_hook
 
278
        if config is None:
 
279
            config = {}
 
280
        logger.debug(u"Creating client %r", self.name)
 
281
        # Uppercase and remove spaces from fingerprint for later
 
282
        # comparison purposes with return value from the fingerprint()
 
283
        # function
 
284
        self.fingerprint = (config[u"fingerprint"].upper()
 
285
                            .replace(u" ", u""))
 
286
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
 
287
        if u"secret" in config:
 
288
            self.secret = config[u"secret"].decode(u"base64")
 
289
        elif u"secfile" in config:
 
290
            with closing(open(os.path.expanduser
 
291
                              (os.path.expandvars
 
292
                               (config[u"secfile"])))) as secfile:
 
293
                self.secret = secfile.read()
 
294
        else:
 
295
            raise TypeError(u"No secret or secfile for client %s"
 
296
                            % self.name)
 
297
        self.host = config.get(u"host", u"")
 
298
        self.created = datetime.datetime.utcnow()
 
299
        self.enabled = False
 
300
        self.last_enabled = None
 
301
        self.last_checked_ok = None
 
302
        self.timeout = string_to_delta(config[u"timeout"])
 
303
        self.interval = string_to_delta(config[u"interval"])
 
304
        self.disable_hook = disable_hook
144
305
        self.checker = None
145
306
        self.checker_initiator_tag = None
146
 
        self.stop_initiator_tag = None
 
307
        self.disable_initiator_tag = None
147
308
        self.checker_callback_tag = None
148
 
        self.check_command = checker
149
 
    def start(self):
150
 
        """Start this clients checker and timeout hooks"""
 
309
        self.checker_command = config[u"checker"]
 
310
        self.current_checker_command = None
 
311
        self.last_connect = None
 
312
    
 
313
    def enable(self):
 
314
        """Start this client's checker and timeout hooks"""
 
315
        if getattr(self, u"enabled", False):
 
316
            # Already enabled
 
317
            return
 
318
        self.last_enabled = datetime.datetime.utcnow()
151
319
        # Schedule a new checker to be started an 'interval' from now,
152
320
        # and every interval from then on.
153
 
        self.checker_initiator_tag = gobject.timeout_add\
154
 
                                     (self._interval_milliseconds,
155
 
                                      self.start_checker)
 
321
        self.checker_initiator_tag = (gobject.timeout_add
 
322
                                      (self.interval_milliseconds(),
 
323
                                       self.start_checker))
156
324
        # Also start a new checker *right now*.
157
325
        self.start_checker()
158
 
        # Schedule a stop() when 'timeout' has passed
159
 
        self.stop_initiator_tag = gobject.timeout_add\
160
 
                                  (self._timeout_milliseconds,
161
 
                                   self.stop)
162
 
    def stop(self):
163
 
        """Stop this client.
164
 
        The possibility that this client might be restarted is left
165
 
        open, but not currently used."""
166
 
        logger.debug(u"Stopping client %s", self.name)
167
 
        self.secret = None
168
 
        if self.stop_initiator_tag:
169
 
            gobject.source_remove(self.stop_initiator_tag)
170
 
            self.stop_initiator_tag = None
171
 
        if self.checker_initiator_tag:
 
326
        # Schedule a disable() when 'timeout' has passed
 
327
        self.disable_initiator_tag = (gobject.timeout_add
 
328
                                   (self.timeout_milliseconds(),
 
329
                                    self.disable))
 
330
        self.enabled = True
 
331
    
 
332
    def disable(self):
 
333
        """Disable this client."""
 
334
        if not getattr(self, "enabled", False):
 
335
            return False
 
336
        logger.info(u"Disabling client %s", self.name)
 
337
        if getattr(self, u"disable_initiator_tag", False):
 
338
            gobject.source_remove(self.disable_initiator_tag)
 
339
            self.disable_initiator_tag = None
 
340
        if getattr(self, u"checker_initiator_tag", False):
172
341
            gobject.source_remove(self.checker_initiator_tag)
173
342
            self.checker_initiator_tag = None
174
343
        self.stop_checker()
175
 
        if self.stop_hook:
176
 
            self.stop_hook(self)
 
344
        if self.disable_hook:
 
345
            self.disable_hook(self)
 
346
        self.enabled = False
177
347
        # Do not run this again if called by a gobject.timeout_add
178
348
        return False
 
349
    
179
350
    def __del__(self):
180
 
        # Some code duplication here and in stop()
181
 
        if hasattr(self, "stop_initiator_tag") \
182
 
               and self.stop_initiator_tag:
183
 
            gobject.source_remove(self.stop_initiator_tag)
184
 
            self.stop_initiator_tag = None
185
 
        if hasattr(self, "checker_initiator_tag") \
186
 
               and self.checker_initiator_tag:
187
 
            gobject.source_remove(self.checker_initiator_tag)
188
 
            self.checker_initiator_tag = None
189
 
        self.stop_checker()
190
 
    def checker_callback(self, pid, condition):
 
351
        self.disable_hook = None
 
352
        self.disable()
 
353
    
 
354
    def checker_callback(self, pid, condition, command):
191
355
        """The checker has completed, so take appropriate actions."""
192
 
        now = datetime.datetime.now()
193
 
        if os.WIFEXITED(condition) \
194
 
               and (os.WEXITSTATUS(condition) == 0):
195
 
            logger.debug(u"Checker for %(name)s succeeded",
196
 
                         vars(self))
197
 
            self.last_seen = now
198
 
            gobject.source_remove(self.stop_initiator_tag)
199
 
            self.stop_initiator_tag = gobject.timeout_add\
200
 
                                      (self._timeout_milliseconds,
201
 
                                       self.stop)
202
 
        elif not os.WIFEXITED(condition):
 
356
        self.checker_callback_tag = None
 
357
        self.checker = None
 
358
        if os.WIFEXITED(condition):
 
359
            exitstatus = os.WEXITSTATUS(condition)
 
360
            if exitstatus == 0:
 
361
                logger.info(u"Checker for %(name)s succeeded",
 
362
                            vars(self))
 
363
                self.checked_ok()
 
364
            else:
 
365
                logger.info(u"Checker for %(name)s failed",
 
366
                            vars(self))
 
367
        else:
203
368
            logger.warning(u"Checker for %(name)s crashed?",
204
369
                           vars(self))
205
 
        else:
206
 
            logger.debug(u"Checker for %(name)s failed",
207
 
                         vars(self))
208
 
            self.checker = None
209
 
        self.checker_callback_tag = None
 
370
    
 
371
    def checked_ok(self):
 
372
        """Bump up the timeout for this client.
 
373
        
 
374
        This should only be called when the client has been seen,
 
375
        alive and well.
 
376
        """
 
377
        self.last_checked_ok = datetime.datetime.utcnow()
 
378
        gobject.source_remove(self.disable_initiator_tag)
 
379
        self.disable_initiator_tag = (gobject.timeout_add
 
380
                                      (self.timeout_milliseconds(),
 
381
                                       self.disable))
 
382
    
210
383
    def start_checker(self):
211
384
        """Start a new checker subprocess if one is not running.
 
385
        
212
386
        If a checker already exists, leave it running and do
213
387
        nothing."""
 
388
        # The reason for not killing a running checker is that if we
 
389
        # did that, then if a checker (for some reason) started
 
390
        # running slowly and taking more than 'interval' time, the
 
391
        # client would inevitably timeout, since no checker would get
 
392
        # a chance to run to completion.  If we instead leave running
 
393
        # checkers alone, the checker would have to take more time
 
394
        # than 'timeout' for the client to be declared invalid, which
 
395
        # is as it should be.
 
396
        
 
397
        # If a checker exists, make sure it is not a zombie
 
398
        if self.checker is not None:
 
399
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
 
400
            if pid:
 
401
                logger.warning(u"Checker was a zombie")
 
402
                gobject.source_remove(self.checker_callback_tag)
 
403
                self.checker_callback(pid, status,
 
404
                                      self.current_checker_command)
 
405
        # Start a new checker if needed
214
406
        if self.checker is None:
215
407
            try:
216
 
                command = self.check_command % self.fqdn
 
408
                # In case checker_command has exactly one % operator
 
409
                command = self.checker_command % self.host
217
410
            except TypeError:
218
 
                escaped_attrs = dict((key, re.escape(str(val)))
 
411
                # Escape attributes for the shell
 
412
                escaped_attrs = dict((key,
 
413
                                      re.escape(unicode(str(val),
 
414
                                                        errors=
 
415
                                                        u'replace')))
219
416
                                     for key, val in
220
417
                                     vars(self).iteritems())
221
418
                try:
222
 
                    command = self.check_command % escaped_attrs
 
419
                    command = self.checker_command % escaped_attrs
223
420
                except TypeError, error:
224
 
                    logger.critical(u'Could not format string "%s":'
225
 
                                    u' %s', self.check_command, error)
 
421
                    logger.error(u'Could not format string "%s":'
 
422
                                 u' %s', self.checker_command, error)
226
423
                    return True # Try again later
 
424
            self.current_checker_command = command
227
425
            try:
228
 
                logger.debug(u"Starting checker %r for %s",
229
 
                             command, self.name)
230
 
                self.checker = subprocess.\
231
 
                               Popen(command,
232
 
                                     close_fds=True, shell=True,
233
 
                                     cwd="/")
234
 
                self.checker_callback_tag = gobject.child_watch_add\
235
 
                                            (self.checker.pid,
236
 
                                             self.checker_callback)
237
 
            except subprocess.OSError, error:
 
426
                logger.info(u"Starting checker %r for %s",
 
427
                            command, self.name)
 
428
                # We don't need to redirect stdout and stderr, since
 
429
                # in normal mode, that is already done by daemon(),
 
430
                # and in debug mode we don't want to.  (Stdin is
 
431
                # always replaced by /dev/null.)
 
432
                self.checker = subprocess.Popen(command,
 
433
                                                close_fds=True,
 
434
                                                shell=True, cwd=u"/")
 
435
                self.checker_callback_tag = (gobject.child_watch_add
 
436
                                             (self.checker.pid,
 
437
                                              self.checker_callback,
 
438
                                              data=command))
 
439
                # The checker may have completed before the gobject
 
440
                # watch was added.  Check for this.
 
441
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
 
442
                if pid:
 
443
                    gobject.source_remove(self.checker_callback_tag)
 
444
                    self.checker_callback(pid, status, command)
 
445
            except OSError, error:
238
446
                logger.error(u"Failed to start subprocess: %s",
239
447
                             error)
240
448
        # Re-run this periodically if run by gobject.timeout_add
241
449
        return True
 
450
    
242
451
    def stop_checker(self):
243
452
        """Force the checker process, if any, to stop."""
244
 
        if not hasattr(self, "checker") or self.checker is None:
 
453
        if self.checker_callback_tag:
 
454
            gobject.source_remove(self.checker_callback_tag)
 
455
            self.checker_callback_tag = None
 
456
        if getattr(self, u"checker", None) is None:
245
457
            return
246
 
        gobject.source_remove(self.checker_callback_tag)
247
 
        self.checker_callback_tag = None
248
 
        os.kill(self.checker.pid, signal.SIGTERM)
249
 
        if self.checker.poll() is None:
250
 
            os.kill(self.checker.pid, signal.SIGKILL)
 
458
        logger.debug(u"Stopping checker for %(name)s", vars(self))
 
459
        try:
 
460
            os.kill(self.checker.pid, signal.SIGTERM)
 
461
            #os.sleep(0.5)
 
462
            #if self.checker.poll() is None:
 
463
            #    os.kill(self.checker.pid, signal.SIGKILL)
 
464
        except OSError, error:
 
465
            if error.errno != errno.ESRCH: # No such process
 
466
                raise
251
467
        self.checker = None
252
 
    def still_valid(self, now=None):
 
468
    
 
469
    def still_valid(self):
253
470
        """Has the timeout not yet passed for this client?"""
254
 
        if now is None:
255
 
            now = datetime.datetime.now()
256
 
        if self.last_seen is None:
 
471
        if not getattr(self, u"enabled", False):
 
472
            return False
 
473
        now = datetime.datetime.utcnow()
 
474
        if self.last_checked_ok is None:
257
475
            return now < (self.created + self.timeout)
258
476
        else:
259
 
            return now < (self.last_seen + self.timeout)
260
 
 
261
 
 
262
 
def peer_certificate(session):
263
 
    "Return an OpenPGP data packet string for the peer's certificate"
264
 
    # If not an OpenPGP certificate...
265
 
    if gnutls.library.functions.gnutls_certificate_type_get\
266
 
            (session._c_object) \
267
 
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
268
 
        # ...do the normal thing
269
 
        return session.peer_certificate
270
 
    list_size = ctypes.c_uint()
271
 
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
272
 
        (session._c_object, ctypes.byref(list_size))
273
 
    if list_size.value == 0:
274
 
        return None
275
 
    cert = cert_list[0]
276
 
    return ctypes.string_at(cert.data, cert.size)
277
 
 
278
 
 
279
 
def fingerprint(openpgp):
280
 
    "Convert an OpenPGP data string to a hexdigit fingerprint string"
281
 
    # New empty GnuTLS certificate
282
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
283
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
284
 
        (ctypes.byref(crt))
285
 
    # New GnuTLS "datum" with the OpenPGP public key
286
 
    datum = gnutls.library.types.gnutls_datum_t\
287
 
        (ctypes.cast(ctypes.c_char_p(openpgp),
288
 
                     ctypes.POINTER(ctypes.c_ubyte)),
289
 
         ctypes.c_uint(len(openpgp)))
290
 
    # Import the OpenPGP public key into the certificate
291
 
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
292
 
        (crt,
293
 
         ctypes.byref(datum),
294
 
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
295
 
    # New buffer for the fingerprint
296
 
    buffer = ctypes.create_string_buffer(20)
297
 
    buffer_length = ctypes.c_size_t()
298
 
    # Get the fingerprint from the certificate into the buffer
299
 
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
300
 
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
301
 
    # Deinit the certificate
302
 
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
303
 
    # Convert the buffer to a Python bytestring
304
 
    fpr = ctypes.string_at(buffer, buffer_length.value)
305
 
    # Convert the bytestring to hexadecimal notation
306
 
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
307
 
    return hex_fpr
308
 
 
309
 
 
310
 
class tcp_handler(SocketServer.BaseRequestHandler, object):
311
 
    """A TCP request handler class.
312
 
    Instantiated by IPv6_TCPServer for each request to handle it.
 
477
            return now < (self.last_checked_ok + self.timeout)
 
478
 
 
479
 
 
480
class ClientDBus(Client, dbus.service.Object):
 
481
    """A Client class using D-Bus
 
482
    
 
483
    Attributes:
 
484
    dbus_object_path: dbus.ObjectPath
 
485
    bus: dbus.SystemBus()
 
486
    """
 
487
    # dbus.service.Object doesn't use super(), so we can't either.
 
488
    
 
489
    def __init__(self, bus = None, *args, **kwargs):
 
490
        self.bus = bus
 
491
        Client.__init__(self, *args, **kwargs)
 
492
        # Only now, when this client is initialized, can it show up on
 
493
        # the D-Bus
 
494
        self.dbus_object_path = (dbus.ObjectPath
 
495
                                 (u"/clients/"
 
496
                                  + self.name.replace(u".", u"_")))
 
497
        dbus.service.Object.__init__(self, self.bus,
 
498
                                     self.dbus_object_path)
 
499
    
 
500
    @staticmethod
 
501
    def _datetime_to_dbus(dt, variant_level=0):
 
502
        """Convert a UTC datetime.datetime() to a D-Bus type."""
 
503
        return dbus.String(dt.isoformat(),
 
504
                           variant_level=variant_level)
 
505
    
 
506
    def enable(self):
 
507
        oldstate = getattr(self, u"enabled", False)
 
508
        r = Client.enable(self)
 
509
        if oldstate != self.enabled:
 
510
            # Emit D-Bus signals
 
511
            self.PropertyChanged(dbus.String(u"enabled"),
 
512
                                 dbus.Boolean(True, variant_level=1))
 
513
            self.PropertyChanged(
 
514
                dbus.String(u"last_enabled"),
 
515
                self._datetime_to_dbus(self.last_enabled,
 
516
                                       variant_level=1))
 
517
        return r
 
518
    
 
519
    def disable(self, signal = True):
 
520
        oldstate = getattr(self, u"enabled", False)
 
521
        r = Client.disable(self)
 
522
        if signal and oldstate != self.enabled:
 
523
            # Emit D-Bus signal
 
524
            self.PropertyChanged(dbus.String(u"enabled"),
 
525
                                 dbus.Boolean(False, variant_level=1))
 
526
        return r
 
527
    
 
528
    def __del__(self, *args, **kwargs):
 
529
        try:
 
530
            self.remove_from_connection()
 
531
        except LookupError:
 
532
            pass
 
533
        if hasattr(dbus.service.Object, u"__del__"):
 
534
            dbus.service.Object.__del__(self, *args, **kwargs)
 
535
        Client.__del__(self, *args, **kwargs)
 
536
    
 
537
    def checker_callback(self, pid, condition, command,
 
538
                         *args, **kwargs):
 
539
        self.checker_callback_tag = None
 
540
        self.checker = None
 
541
        # Emit D-Bus signal
 
542
        self.PropertyChanged(dbus.String(u"checker_running"),
 
543
                             dbus.Boolean(False, variant_level=1))
 
544
        if os.WIFEXITED(condition):
 
545
            exitstatus = os.WEXITSTATUS(condition)
 
546
            # Emit D-Bus signal
 
547
            self.CheckerCompleted(dbus.Int16(exitstatus),
 
548
                                  dbus.Int64(condition),
 
549
                                  dbus.String(command))
 
550
        else:
 
551
            # Emit D-Bus signal
 
552
            self.CheckerCompleted(dbus.Int16(-1),
 
553
                                  dbus.Int64(condition),
 
554
                                  dbus.String(command))
 
555
        
 
556
        return Client.checker_callback(self, pid, condition, command,
 
557
                                       *args, **kwargs)
 
558
    
 
559
    def checked_ok(self, *args, **kwargs):
 
560
        r = Client.checked_ok(self, *args, **kwargs)
 
561
        # Emit D-Bus signal
 
562
        self.PropertyChanged(
 
563
            dbus.String(u"last_checked_ok"),
 
564
            (self._datetime_to_dbus(self.last_checked_ok,
 
565
                                    variant_level=1)))
 
566
        return r
 
567
    
 
568
    def start_checker(self, *args, **kwargs):
 
569
        old_checker = self.checker
 
570
        if self.checker is not None:
 
571
            old_checker_pid = self.checker.pid
 
572
        else:
 
573
            old_checker_pid = None
 
574
        r = Client.start_checker(self, *args, **kwargs)
 
575
        # Only if new checker process was started
 
576
        if (self.checker is not None
 
577
            and old_checker_pid != self.checker.pid):
 
578
            # Emit D-Bus signal
 
579
            self.CheckerStarted(self.current_checker_command)
 
580
            self.PropertyChanged(
 
581
                dbus.String(u"checker_running"),
 
582
                dbus.Boolean(True, variant_level=1))
 
583
        return r
 
584
    
 
585
    def stop_checker(self, *args, **kwargs):
 
586
        old_checker = getattr(self, u"checker", None)
 
587
        r = Client.stop_checker(self, *args, **kwargs)
 
588
        if (old_checker is not None
 
589
            and getattr(self, u"checker", None) is None):
 
590
            self.PropertyChanged(dbus.String(u"checker_running"),
 
591
                                 dbus.Boolean(False, variant_level=1))
 
592
        return r
 
593
    
 
594
    ## D-Bus methods & signals
 
595
    _interface = u"se.bsnet.fukt.Mandos.Client"
 
596
    
 
597
    # CheckedOK - method
 
598
    @dbus.service.method(_interface)
 
599
    def CheckedOK(self):
 
600
        return self.checked_ok()
 
601
    
 
602
    # CheckerCompleted - signal
 
603
    @dbus.service.signal(_interface, signature=u"nxs")
 
604
    def CheckerCompleted(self, exitcode, waitstatus, command):
 
605
        "D-Bus signal"
 
606
        pass
 
607
    
 
608
    # CheckerStarted - signal
 
609
    @dbus.service.signal(_interface, signature=u"s")
 
610
    def CheckerStarted(self, command):
 
611
        "D-Bus signal"
 
612
        pass
 
613
    
 
614
    # GetAllProperties - method
 
615
    @dbus.service.method(_interface, out_signature=u"a{sv}")
 
616
    def GetAllProperties(self):
 
617
        "D-Bus method"
 
618
        return dbus.Dictionary({
 
619
                dbus.String(u"name"):
 
620
                    dbus.String(self.name, variant_level=1),
 
621
                dbus.String(u"fingerprint"):
 
622
                    dbus.String(self.fingerprint, variant_level=1),
 
623
                dbus.String(u"host"):
 
624
                    dbus.String(self.host, variant_level=1),
 
625
                dbus.String(u"created"):
 
626
                    self._datetime_to_dbus(self.created,
 
627
                                           variant_level=1),
 
628
                dbus.String(u"last_enabled"):
 
629
                    (self._datetime_to_dbus(self.last_enabled,
 
630
                                            variant_level=1)
 
631
                     if self.last_enabled is not None
 
632
                     else dbus.Boolean(False, variant_level=1)),
 
633
                dbus.String(u"enabled"):
 
634
                    dbus.Boolean(self.enabled, variant_level=1),
 
635
                dbus.String(u"last_checked_ok"):
 
636
                    (self._datetime_to_dbus(self.last_checked_ok,
 
637
                                            variant_level=1)
 
638
                     if self.last_checked_ok is not None
 
639
                     else dbus.Boolean (False, variant_level=1)),
 
640
                dbus.String(u"timeout"):
 
641
                    dbus.UInt64(self.timeout_milliseconds(),
 
642
                                variant_level=1),
 
643
                dbus.String(u"interval"):
 
644
                    dbus.UInt64(self.interval_milliseconds(),
 
645
                                variant_level=1),
 
646
                dbus.String(u"checker"):
 
647
                    dbus.String(self.checker_command,
 
648
                                variant_level=1),
 
649
                dbus.String(u"checker_running"):
 
650
                    dbus.Boolean(self.checker is not None,
 
651
                                 variant_level=1),
 
652
                dbus.String(u"object_path"):
 
653
                    dbus.ObjectPath(self.dbus_object_path,
 
654
                                    variant_level=1)
 
655
                }, signature=u"sv")
 
656
    
 
657
    # IsStillValid - method
 
658
    @dbus.service.method(_interface, out_signature=u"b")
 
659
    def IsStillValid(self):
 
660
        return self.still_valid()
 
661
    
 
662
    # PropertyChanged - signal
 
663
    @dbus.service.signal(_interface, signature=u"sv")
 
664
    def PropertyChanged(self, property, value):
 
665
        "D-Bus signal"
 
666
        pass
 
667
    
 
668
    # ReceivedSecret - signal
 
669
    @dbus.service.signal(_interface)
 
670
    def ReceivedSecret(self):
 
671
        "D-Bus signal"
 
672
        pass
 
673
    
 
674
    # Rejected - signal
 
675
    @dbus.service.signal(_interface)
 
676
    def Rejected(self):
 
677
        "D-Bus signal"
 
678
        pass
 
679
    
 
680
    # SetChecker - method
 
681
    @dbus.service.method(_interface, in_signature=u"s")
 
682
    def SetChecker(self, checker):
 
683
        "D-Bus setter method"
 
684
        self.checker_command = checker
 
685
        # Emit D-Bus signal
 
686
        self.PropertyChanged(dbus.String(u"checker"),
 
687
                             dbus.String(self.checker_command,
 
688
                                         variant_level=1))
 
689
    
 
690
    # SetHost - method
 
691
    @dbus.service.method(_interface, in_signature=u"s")
 
692
    def SetHost(self, host):
 
693
        "D-Bus setter method"
 
694
        self.host = host
 
695
        # Emit D-Bus signal
 
696
        self.PropertyChanged(dbus.String(u"host"),
 
697
                             dbus.String(self.host, variant_level=1))
 
698
    
 
699
    # SetInterval - method
 
700
    @dbus.service.method(_interface, in_signature=u"t")
 
701
    def SetInterval(self, milliseconds):
 
702
        self.interval = datetime.timedelta(0, 0, 0, milliseconds)
 
703
        # Emit D-Bus signal
 
704
        self.PropertyChanged(dbus.String(u"interval"),
 
705
                             (dbus.UInt64(self.interval_milliseconds(),
 
706
                                          variant_level=1)))
 
707
    
 
708
    # SetSecret - method
 
709
    @dbus.service.method(_interface, in_signature=u"ay",
 
710
                         byte_arrays=True)
 
711
    def SetSecret(self, secret):
 
712
        "D-Bus setter method"
 
713
        self.secret = str(secret)
 
714
    
 
715
    # SetTimeout - method
 
716
    @dbus.service.method(_interface, in_signature=u"t")
 
717
    def SetTimeout(self, milliseconds):
 
718
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
 
719
        # Emit D-Bus signal
 
720
        self.PropertyChanged(dbus.String(u"timeout"),
 
721
                             (dbus.UInt64(self.timeout_milliseconds(),
 
722
                                          variant_level=1)))
 
723
    
 
724
    # Enable - method
 
725
    @dbus.service.method(_interface)
 
726
    def Enable(self):
 
727
        "D-Bus method"
 
728
        self.enable()
 
729
    
 
730
    # StartChecker - method
 
731
    @dbus.service.method(_interface)
 
732
    def StartChecker(self):
 
733
        "D-Bus method"
 
734
        self.start_checker()
 
735
    
 
736
    # Disable - method
 
737
    @dbus.service.method(_interface)
 
738
    def Disable(self):
 
739
        "D-Bus method"
 
740
        self.disable()
 
741
    
 
742
    # StopChecker - method
 
743
    @dbus.service.method(_interface)
 
744
    def StopChecker(self):
 
745
        self.stop_checker()
 
746
    
 
747
    del _interface
 
748
 
 
749
 
 
750
class ClientHandler(socketserver.BaseRequestHandler, object):
 
751
    """A class to handle client connections.
 
752
    
 
753
    Instantiated once for each connection to handle it.
313
754
    Note: This will run in its own forked process."""
314
755
    
315
756
    def handle(self):
316
 
        logger.debug(u"TCP connection from: %s",
317
 
                     unicode(self.client_address))
318
 
        session = gnutls.connection.ClientSession(self.request,
319
 
                                                  gnutls.connection.\
320
 
                                                  X509Credentials())
321
 
        
322
 
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
323
 
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
324
 
        #                "+DHE-DSS"))
325
 
        priority = "SECURE256"
326
 
        
327
 
        gnutls.library.functions.gnutls_priority_set_direct\
328
 
            (session._c_object, priority, None);
329
 
        
330
 
        try:
331
 
            session.handshake()
332
 
        except gnutls.errors.GNUTLSError, error:
333
 
            logger.debug(u"Handshake failed: %s", error)
334
 
            # Do not run session.bye() here: the session is not
335
 
            # established.  Just abandon the request.
336
 
            return
337
 
        try:
338
 
            fpr = fingerprint(peer_certificate(session))
339
 
        except (TypeError, gnutls.errors.GNUTLSError), error:
340
 
            logger.debug(u"Bad certificate: %s", error)
341
 
            session.bye()
342
 
            return
343
 
        logger.debug(u"Fingerprint: %s", fpr)
344
 
        client = None
345
 
        for c in clients:
346
 
            if c.fingerprint == fpr:
347
 
                client = c
348
 
                break
349
 
        # Have to check if client.still_valid(), since it is possible
350
 
        # that the client timed out while establishing the GnuTLS
351
 
        # session.
352
 
        if (not client) or (not client.still_valid()):
353
 
            if client:
354
 
                logger.debug(u"Client %(name)s is invalid",
355
 
                             vars(client))
 
757
        logger.info(u"TCP connection from: %s",
 
758
                    unicode(self.client_address))
 
759
        logger.debug(u"IPC Pipe FD: %d", self.server.pipe[1])
 
760
        # Open IPC pipe to parent process
 
761
        with closing(os.fdopen(self.server.pipe[1], u"w", 1)) as ipc:
 
762
            session = (gnutls.connection
 
763
                       .ClientSession(self.request,
 
764
                                      gnutls.connection
 
765
                                      .X509Credentials()))
 
766
            
 
767
            line = self.request.makefile().readline()
 
768
            logger.debug(u"Protocol version: %r", line)
 
769
            try:
 
770
                if int(line.strip().split()[0]) > 1:
 
771
                    raise RuntimeError
 
772
            except (ValueError, IndexError, RuntimeError), error:
 
773
                logger.error(u"Unknown protocol version: %s", error)
 
774
                return
 
775
            
 
776
            # Note: gnutls.connection.X509Credentials is really a
 
777
            # generic GnuTLS certificate credentials object so long as
 
778
            # no X.509 keys are added to it.  Therefore, we can use it
 
779
            # here despite using OpenPGP certificates.
 
780
            
 
781
            #priority = u':'.join((u"NONE", u"+VERS-TLS1.1",
 
782
            #                      u"+AES-256-CBC", u"+SHA1",
 
783
            #                      u"+COMP-NULL", u"+CTYPE-OPENPGP",
 
784
            #                      u"+DHE-DSS"))
 
785
            # Use a fallback default, since this MUST be set.
 
786
            priority = self.server.gnutls_priority
 
787
            if priority is None:
 
788
                priority = u"NORMAL"
 
789
            (gnutls.library.functions
 
790
             .gnutls_priority_set_direct(session._c_object,
 
791
                                         priority, None))
 
792
            
 
793
            try:
 
794
                session.handshake()
 
795
            except gnutls.errors.GNUTLSError, error:
 
796
                logger.warning(u"Handshake failed: %s", error)
 
797
                # Do not run session.bye() here: the session is not
 
798
                # established.  Just abandon the request.
 
799
                return
 
800
            logger.debug(u"Handshake succeeded")
 
801
            try:
 
802
                fpr = self.fingerprint(self.peer_certificate(session))
 
803
            except (TypeError, gnutls.errors.GNUTLSError), error:
 
804
                logger.warning(u"Bad certificate: %s", error)
 
805
                session.bye()
 
806
                return
 
807
            logger.debug(u"Fingerprint: %s", fpr)
 
808
            
 
809
            for c in self.server.clients:
 
810
                if c.fingerprint == fpr:
 
811
                    client = c
 
812
                    break
356
813
            else:
357
 
                logger.debug(u"Client not found for fingerprint: %s",
358
 
                             fpr)
 
814
                ipc.write(u"NOTFOUND %s %s\n"
 
815
                          % (fpr, unicode(self.client_address)))
 
816
                session.bye()
 
817
                return
 
818
            # Have to check if client.still_valid(), since it is
 
819
            # possible that the client timed out while establishing
 
820
            # the GnuTLS session.
 
821
            if not client.still_valid():
 
822
                ipc.write(u"INVALID %s\n" % client.name)
 
823
                session.bye()
 
824
                return
 
825
            ipc.write(u"SENDING %s\n" % client.name)
 
826
            sent_size = 0
 
827
            while sent_size < len(client.secret):
 
828
                sent = session.send(client.secret[sent_size:])
 
829
                logger.debug(u"Sent: %d, remaining: %d",
 
830
                             sent, len(client.secret)
 
831
                             - (sent_size + sent))
 
832
                sent_size += sent
359
833
            session.bye()
360
 
            return
361
 
        sent_size = 0
362
 
        while sent_size < len(client.secret):
363
 
            sent = session.send(client.secret[sent_size:])
364
 
            logger.debug(u"Sent: %d, remaining: %d",
365
 
                         sent, len(client.secret)
366
 
                         - (sent_size + sent))
367
 
            sent_size += sent
368
 
        session.bye()
369
 
 
370
 
 
371
 
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
372
 
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
 
834
    
 
835
    @staticmethod
 
836
    def peer_certificate(session):
 
837
        "Return the peer's OpenPGP certificate as a bytestring"
 
838
        # If not an OpenPGP certificate...
 
839
        if (gnutls.library.functions
 
840
            .gnutls_certificate_type_get(session._c_object)
 
841
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
842
            # ...do the normal thing
 
843
            return session.peer_certificate
 
844
        list_size = ctypes.c_uint(1)
 
845
        cert_list = (gnutls.library.functions
 
846
                     .gnutls_certificate_get_peers
 
847
                     (session._c_object, ctypes.byref(list_size)))
 
848
        if not bool(cert_list) and list_size.value != 0:
 
849
            raise gnutls.errors.GNUTLSError(u"error getting peer"
 
850
                                            u" certificate")
 
851
        if list_size.value == 0:
 
852
            return None
 
853
        cert = cert_list[0]
 
854
        return ctypes.string_at(cert.data, cert.size)
 
855
    
 
856
    @staticmethod
 
857
    def fingerprint(openpgp):
 
858
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
 
859
        # New GnuTLS "datum" with the OpenPGP public key
 
860
        datum = (gnutls.library.types
 
861
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
 
862
                                             ctypes.POINTER
 
863
                                             (ctypes.c_ubyte)),
 
864
                                 ctypes.c_uint(len(openpgp))))
 
865
        # New empty GnuTLS certificate
 
866
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
867
        (gnutls.library.functions
 
868
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
869
        # Import the OpenPGP public key into the certificate
 
870
        (gnutls.library.functions
 
871
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
 
872
                                    gnutls.library.constants
 
873
                                    .GNUTLS_OPENPGP_FMT_RAW))
 
874
        # Verify the self signature in the key
 
875
        crtverify = ctypes.c_uint()
 
876
        (gnutls.library.functions
 
877
         .gnutls_openpgp_crt_verify_self(crt, 0,
 
878
                                         ctypes.byref(crtverify)))
 
879
        if crtverify.value != 0:
 
880
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
881
            raise (gnutls.errors.CertificateSecurityError
 
882
                   (u"Verify failed"))
 
883
        # New buffer for the fingerprint
 
884
        buf = ctypes.create_string_buffer(20)
 
885
        buf_len = ctypes.c_size_t()
 
886
        # Get the fingerprint from the certificate into the buffer
 
887
        (gnutls.library.functions
 
888
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
 
889
                                             ctypes.byref(buf_len)))
 
890
        # Deinit the certificate
 
891
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
892
        # Convert the buffer to a Python bytestring
 
893
        fpr = ctypes.string_at(buf, buf_len.value)
 
894
        # Convert the bytestring to hexadecimal notation
 
895
        hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
896
        return hex_fpr
 
897
 
 
898
 
 
899
class ForkingMixInWithPipe(socketserver.ForkingMixIn, object):
 
900
    """Like socketserver.ForkingMixIn, but also pass a pipe."""
 
901
    def process_request(self, request, client_address):
 
902
        """Overrides and wraps the original process_request().
 
903
        
 
904
        This function creates a new pipe in self.pipe
 
905
        """
 
906
        self.pipe = os.pipe()
 
907
        super(ForkingMixInWithPipe,
 
908
              self).process_request(request, client_address)
 
909
        os.close(self.pipe[1])  # close write end
 
910
        self.add_pipe(self.pipe[0])
 
911
    def add_pipe(self, pipe):
 
912
        """Dummy function; override as necessary"""
 
913
        os.close(pipe)
 
914
 
 
915
 
 
916
class IPv6_TCPServer(ForkingMixInWithPipe,
 
917
                     socketserver.TCPServer, object):
 
918
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
 
919
    
373
920
    Attributes:
374
 
        options:        Command line options
375
 
        clients:        Set() of Client objects
 
921
        enabled:        Boolean; whether this server is activated yet
 
922
        interface:      None or a network interface name (string)
 
923
        use_ipv6:       Boolean; to use IPv6 or not
376
924
    """
377
 
    address_family = socket.AF_INET6
378
 
    def __init__(self, *args, **kwargs):
379
 
        if "options" in kwargs:
380
 
            self.options = kwargs["options"]
381
 
            del kwargs["options"]
382
 
        if "clients" in kwargs:
383
 
            self.clients = kwargs["clients"]
384
 
            del kwargs["clients"]
385
 
        return super(type(self), self).__init__(*args, **kwargs)
 
925
    def __init__(self, server_address, RequestHandlerClass,
 
926
                 interface=None, use_ipv6=True):
 
927
        self.interface = interface
 
928
        if use_ipv6:
 
929
            self.address_family = socket.AF_INET6
 
930
        socketserver.TCPServer.__init__(self, server_address,
 
931
                                        RequestHandlerClass)
386
932
    def server_bind(self):
387
933
        """This overrides the normal server_bind() function
388
934
        to bind to an interface if one was specified, and also NOT to
389
935
        bind to an address or port if they were not specified."""
390
 
        if self.options.interface:
391
 
            if not hasattr(socket, "SO_BINDTODEVICE"):
392
 
                # From /usr/include/asm-i486/socket.h
393
 
                socket.SO_BINDTODEVICE = 25
394
 
            try:
395
 
                self.socket.setsockopt(socket.SOL_SOCKET,
396
 
                                       socket.SO_BINDTODEVICE,
397
 
                                       self.options.interface)
398
 
            except socket.error, error:
399
 
                if error[0] == errno.EPERM:
400
 
                    logger.warning(u"No permission to"
401
 
                                   u" bind to interface %s",
402
 
                                   self.options.interface)
403
 
                else:
404
 
                    raise error
 
936
        if self.interface is not None:
 
937
            if SO_BINDTODEVICE is None:
 
938
                logger.error(u"SO_BINDTODEVICE does not exist;"
 
939
                             u" cannot bind to interface %s",
 
940
                             self.interface)
 
941
            else:
 
942
                try:
 
943
                    self.socket.setsockopt(socket.SOL_SOCKET,
 
944
                                           SO_BINDTODEVICE,
 
945
                                           str(self.interface
 
946
                                               + u'\0'))
 
947
                except socket.error, error:
 
948
                    if error[0] == errno.EPERM:
 
949
                        logger.error(u"No permission to"
 
950
                                     u" bind to interface %s",
 
951
                                     self.interface)
 
952
                    elif error[0] == errno.ENOPROTOOPT:
 
953
                        logger.error(u"SO_BINDTODEVICE not available;"
 
954
                                     u" cannot bind to interface %s",
 
955
                                     self.interface)
 
956
                    else:
 
957
                        raise
405
958
        # Only bind(2) the socket if we really need to.
406
959
        if self.server_address[0] or self.server_address[1]:
407
960
            if not self.server_address[0]:
408
 
                in6addr_any = "::"
409
 
                self.server_address = (in6addr_any,
 
961
                if self.address_family == socket.AF_INET6:
 
962
                    any_address = u"::" # in6addr_any
 
963
                else:
 
964
                    any_address = socket.INADDR_ANY
 
965
                self.server_address = (any_address,
410
966
                                       self.server_address[1])
411
 
            elif self.server_address[1] is None:
 
967
            elif not self.server_address[1]:
412
968
                self.server_address = (self.server_address[0],
413
969
                                       0)
414
 
            return super(type(self), self).server_bind()
 
970
#                 if self.interface:
 
971
#                     self.server_address = (self.server_address[0],
 
972
#                                            0, # port
 
973
#                                            0, # flowinfo
 
974
#                                            if_nametoindex
 
975
#                                            (self.interface))
 
976
            return socketserver.TCPServer.server_bind(self)
 
977
 
 
978
 
 
979
class MandosServer(IPv6_TCPServer):
 
980
    """Mandos server.
 
981
    
 
982
    Attributes:
 
983
        clients:        set of Client objects
 
984
        gnutls_priority GnuTLS priority string
 
985
        use_dbus:       Boolean; to emit D-Bus signals or not
 
986
        clients:        set of Client objects
 
987
        gnutls_priority GnuTLS priority string
 
988
        use_dbus:       Boolean; to emit D-Bus signals or not
 
989
    
 
990
    Assumes a gobject.MainLoop event loop.
 
991
    """
 
992
    def __init__(self, server_address, RequestHandlerClass,
 
993
                 interface=None, use_ipv6=True, clients=None,
 
994
                 gnutls_priority=None, use_dbus=True):
 
995
        self.enabled = False
 
996
        self.clients = clients
 
997
        if self.clients is None:
 
998
            self.clients = set()
 
999
        self.use_dbus = use_dbus
 
1000
        self.gnutls_priority = gnutls_priority
 
1001
        IPv6_TCPServer.__init__(self, server_address,
 
1002
                                RequestHandlerClass,
 
1003
                                interface = interface,
 
1004
                                use_ipv6 = use_ipv6)
 
1005
    def server_activate(self):
 
1006
        if self.enabled:
 
1007
            return socketserver.TCPServer.server_activate(self)
 
1008
    def enable(self):
 
1009
        self.enabled = True
 
1010
    def add_pipe(self, pipe):
 
1011
        # Call "handle_ipc" for both data and EOF events
 
1012
        gobject.io_add_watch(pipe, gobject.IO_IN | gobject.IO_HUP,
 
1013
                             self.handle_ipc)
 
1014
    def handle_ipc(self, source, condition, file_objects={}):
 
1015
        condition_names = {
 
1016
            gobject.IO_IN: u"IN",   # There is data to read.
 
1017
            gobject.IO_OUT: u"OUT", # Data can be written (without
 
1018
                                    # blocking).
 
1019
            gobject.IO_PRI: u"PRI", # There is urgent data to read.
 
1020
            gobject.IO_ERR: u"ERR", # Error condition.
 
1021
            gobject.IO_HUP: u"HUP"  # Hung up (the connection has been
 
1022
                                    # broken, usually for pipes and
 
1023
                                    # sockets).
 
1024
            }
 
1025
        conditions_string = ' | '.join(name
 
1026
                                       for cond, name in
 
1027
                                       condition_names.iteritems()
 
1028
                                       if cond & condition)
 
1029
        logger.debug(u"Handling IPC: FD = %d, condition = %s", source,
 
1030
                     conditions_string)
 
1031
        
 
1032
        # Turn the pipe file descriptor into a Python file object
 
1033
        if source not in file_objects:
 
1034
            file_objects[source] = os.fdopen(source, u"r", 1)
 
1035
        
 
1036
        # Read a line from the file object
 
1037
        cmdline = file_objects[source].readline()
 
1038
        if not cmdline:             # Empty line means end of file
 
1039
            # close the IPC pipe
 
1040
            file_objects[source].close()
 
1041
            del file_objects[source]
 
1042
            
 
1043
            # Stop calling this function
 
1044
            return False
 
1045
        
 
1046
        logger.debug(u"IPC command: %r", cmdline)
 
1047
        
 
1048
        # Parse and act on command
 
1049
        cmd, args = cmdline.rstrip(u"\r\n").split(None, 1)
 
1050
        
 
1051
        if cmd == u"NOTFOUND":
 
1052
            logger.warning(u"Client not found for fingerprint: %s",
 
1053
                           args)
 
1054
            if self.use_dbus:
 
1055
                # Emit D-Bus signal
 
1056
                mandos_dbus_service.ClientNotFound(args)
 
1057
        elif cmd == u"INVALID":
 
1058
            for client in self.clients:
 
1059
                if client.name == args:
 
1060
                    logger.warning(u"Client %s is invalid", args)
 
1061
                    if self.use_dbus:
 
1062
                        # Emit D-Bus signal
 
1063
                        client.Rejected()
 
1064
                    break
 
1065
            else:
 
1066
                logger.error(u"Unknown client %s is invalid", args)
 
1067
        elif cmd == u"SENDING":
 
1068
            for client in self.clients:
 
1069
                if client.name == args:
 
1070
                    logger.info(u"Sending secret to %s", client.name)
 
1071
                    client.checked_ok()
 
1072
                    if self.use_dbus:
 
1073
                        # Emit D-Bus signal
 
1074
                        client.ReceivedSecret()
 
1075
                    break
 
1076
            else:
 
1077
                logger.error(u"Sending secret to unknown client %s",
 
1078
                             args)
 
1079
        else:
 
1080
            logger.error(u"Unknown IPC command: %r", cmdline)
 
1081
        
 
1082
        # Keep calling this function
 
1083
        return True
415
1084
 
416
1085
 
417
1086
def string_to_delta(interval):
418
1087
    """Parse a string and return a datetime.timedelta
419
 
 
420
 
    >>> string_to_delta('7d')
 
1088
    
 
1089
    >>> string_to_delta(u'7d')
421
1090
    datetime.timedelta(7)
422
 
    >>> string_to_delta('60s')
 
1091
    >>> string_to_delta(u'60s')
423
1092
    datetime.timedelta(0, 60)
424
 
    >>> string_to_delta('60m')
 
1093
    >>> string_to_delta(u'60m')
425
1094
    datetime.timedelta(0, 3600)
426
 
    >>> string_to_delta('24h')
 
1095
    >>> string_to_delta(u'24h')
427
1096
    datetime.timedelta(1)
428
1097
    >>> string_to_delta(u'1w')
429
1098
    datetime.timedelta(7)
 
1099
    >>> string_to_delta(u'5m 30s')
 
1100
    datetime.timedelta(0, 330)
430
1101
    """
431
 
    try:
432
 
        suffix=unicode(interval[-1])
433
 
        value=int(interval[:-1])
434
 
        if suffix == u"d":
435
 
            delta = datetime.timedelta(value)
436
 
        elif suffix == u"s":
437
 
            delta = datetime.timedelta(0, value)
438
 
        elif suffix == u"m":
439
 
            delta = datetime.timedelta(0, 0, 0, 0, value)
440
 
        elif suffix == u"h":
441
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
442
 
        elif suffix == u"w":
443
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
444
 
        else:
 
1102
    timevalue = datetime.timedelta(0)
 
1103
    for s in interval.split():
 
1104
        try:
 
1105
            suffix = unicode(s[-1])
 
1106
            value = int(s[:-1])
 
1107
            if suffix == u"d":
 
1108
                delta = datetime.timedelta(value)
 
1109
            elif suffix == u"s":
 
1110
                delta = datetime.timedelta(0, value)
 
1111
            elif suffix == u"m":
 
1112
                delta = datetime.timedelta(0, 0, 0, 0, value)
 
1113
            elif suffix == u"h":
 
1114
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
1115
            elif suffix == u"w":
 
1116
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
1117
            else:
 
1118
                raise ValueError
 
1119
        except (ValueError, IndexError):
445
1120
            raise ValueError
446
 
    except (ValueError, IndexError):
447
 
        raise ValueError
448
 
    return delta
449
 
 
450
 
 
451
 
def add_service():
452
 
    """From the Avahi server example code"""
453
 
    global group, serviceName, serviceType, servicePort, serviceTXT, \
454
 
           domain, host
455
 
    if group is None:
456
 
        group = dbus.Interface(
457
 
                bus.get_object( avahi.DBUS_NAME,
458
 
                                server.EntryGroupNew()),
459
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
460
 
        group.connect_to_signal('StateChanged',
461
 
                                entry_group_state_changed)
462
 
    logger.debug(u"Adding service '%s' of type '%s' ...",
463
 
                 serviceName, serviceType)
464
 
    
465
 
    group.AddService(
466
 
            serviceInterface,           # interface
467
 
            avahi.PROTO_INET6,          # protocol
468
 
            dbus.UInt32(0),             # flags
469
 
            serviceName, serviceType,
470
 
            domain, host,
471
 
            dbus.UInt16(servicePort),
472
 
            avahi.string_array_to_txt_array(serviceTXT))
473
 
    group.Commit()
474
 
 
475
 
 
476
 
def remove_service():
477
 
    """From the Avahi server example code"""
478
 
    global group
479
 
    
480
 
    if not group is None:
481
 
        group.Reset()
482
 
 
483
 
 
484
 
def server_state_changed(state):
485
 
    """From the Avahi server example code"""
486
 
    if state == avahi.SERVER_COLLISION:
487
 
        logger.warning(u"Server name collision")
488
 
        remove_service()
489
 
    elif state == avahi.SERVER_RUNNING:
490
 
        add_service()
491
 
 
492
 
 
493
 
def entry_group_state_changed(state, error):
494
 
    """From the Avahi server example code"""
495
 
    global serviceName, server, rename_count
496
 
    
497
 
    logger.debug(u"state change: %i", state)
498
 
    
499
 
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
500
 
        logger.debug(u"Service established.")
501
 
    elif state == avahi.ENTRY_GROUP_COLLISION:
502
 
        
503
 
        rename_count = rename_count - 1
504
 
        if rename_count > 0:
505
 
            name = server.GetAlternativeServiceName(name)
506
 
            logger.warning(u"Service name collision, "
507
 
                           u"changing name to '%s' ...", name)
508
 
            remove_service()
509
 
            add_service()
510
 
            
511
 
        else:
512
 
            logger.error(u"No suitable service name found after %i"
513
 
                         u" retries, exiting.", n_rename)
514
 
            killme(1)
515
 
    elif state == avahi.ENTRY_GROUP_FAILURE:
516
 
        logger.error(u"Error in group state changed %s",
517
 
                     unicode(error))
518
 
        killme(1)
 
1121
        timevalue += delta
 
1122
    return timevalue
519
1123
 
520
1124
 
521
1125
def if_nametoindex(interface):
522
 
    """Call the C function if_nametoindex()"""
 
1126
    """Call the C function if_nametoindex(), or equivalent
 
1127
    
 
1128
    Note: This function cannot accept a unicode string."""
 
1129
    global if_nametoindex
523
1130
    try:
524
 
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
525
 
        return libc.if_nametoindex(interface)
 
1131
        if_nametoindex = (ctypes.cdll.LoadLibrary
 
1132
                          (ctypes.util.find_library(u"c"))
 
1133
                          .if_nametoindex)
526
1134
    except (OSError, AttributeError):
527
 
        if "struct" not in sys.modules:
528
 
            import struct
529
 
        if "fcntl" not in sys.modules:
530
 
            import fcntl
531
 
        SIOCGIFINDEX = 0x8933      # From /usr/include/linux/sockios.h
532
 
        s = socket.socket()
533
 
        ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
534
 
                            struct.pack("16s16x", interface))
535
 
        s.close()
536
 
        interface_index = struct.unpack("I", ifreq[16:20])[0]
537
 
        return interface_index
538
 
 
539
 
 
540
 
def daemon(nochdir, noclose):
 
1135
        logger.warning(u"Doing if_nametoindex the hard way")
 
1136
        def if_nametoindex(interface):
 
1137
            "Get an interface index the hard way, i.e. using fcntl()"
 
1138
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
 
1139
            with closing(socket.socket()) as s:
 
1140
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
1141
                                    struct.pack(str(u"16s16x"),
 
1142
                                                interface))
 
1143
            interface_index = struct.unpack(str(u"I"),
 
1144
                                            ifreq[16:20])[0]
 
1145
            return interface_index
 
1146
    return if_nametoindex(interface)
 
1147
 
 
1148
 
 
1149
def daemon(nochdir = False, noclose = False):
541
1150
    """See daemon(3).  Standard BSD Unix function.
 
1151
    
542
1152
    This should really exist as os.daemon, but it doesn't (yet)."""
543
1153
    if os.fork():
544
1154
        sys.exit()
545
1155
    os.setsid()
546
1156
    if not nochdir:
547
 
        os.chdir("/")
 
1157
        os.chdir(u"/")
 
1158
    if os.fork():
 
1159
        sys.exit()
548
1160
    if not noclose:
549
1161
        # Close all standard open file descriptors
550
 
        null = os.open("/dev/null", os.O_NOCTTY | os.O_RDWR)
 
1162
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
551
1163
        if not stat.S_ISCHR(os.fstat(null).st_mode):
552
1164
            raise OSError(errno.ENODEV,
553
 
                          "/dev/null not a character device")
 
1165
                          u"/dev/null not a character device")
554
1166
        os.dup2(null, sys.stdin.fileno())
555
1167
        os.dup2(null, sys.stdout.fileno())
556
1168
        os.dup2(null, sys.stderr.fileno())
558
1170
            os.close(null)
559
1171
 
560
1172
 
561
 
def killme(status = 0):
562
 
    logger.debug("Stopping server with exit status %d", status)
563
 
    exitstatus = status
564
 
    if main_loop_started:
565
 
        main_loop.quit()
566
 
    else:
567
 
        sys.exit(status)
568
 
 
569
 
 
570
 
if __name__ == '__main__':
571
 
    exitstatus = 0
572
 
    main_loop_started = False
573
 
    parser = OptionParser()
574
 
    parser.add_option("-i", "--interface", type="string",
575
 
                      default=None, metavar="IF",
576
 
                      help="Bind to interface IF")
577
 
    parser.add_option("-p", "--port", type="int", default=None,
578
 
                      help="Port number to receive requests on")
579
 
    parser.add_option("--timeout", type="string", # Parsed later
580
 
                      default="1h",
581
 
                      help="Amount of downtime allowed for clients")
582
 
    parser.add_option("--interval", type="string", # Parsed later
583
 
                      default="5m",
584
 
                      help="How often to check that a client is up")
585
 
    parser.add_option("--check", action="store_true", default=False,
586
 
                      help="Run self-test")
587
 
    parser.add_option("--debug", action="store_true", default=False,
588
 
                      help="Debug mode")
589
 
    (options, args) = parser.parse_args()
 
1173
def main():
 
1174
    
 
1175
    ######################################################################
 
1176
    # Parsing of options, both command line and config file
 
1177
    
 
1178
    parser = optparse.OptionParser(version = "%%prog %s" % version)
 
1179
    parser.add_option("-i", u"--interface", type=u"string",
 
1180
                      metavar="IF", help=u"Bind to interface IF")
 
1181
    parser.add_option("-a", u"--address", type=u"string",
 
1182
                      help=u"Address to listen for requests on")
 
1183
    parser.add_option("-p", u"--port", type=u"int",
 
1184
                      help=u"Port number to receive requests on")
 
1185
    parser.add_option("--check", action=u"store_true",
 
1186
                      help=u"Run self-test")
 
1187
    parser.add_option("--debug", action=u"store_true",
 
1188
                      help=u"Debug mode; run in foreground and log to"
 
1189
                      u" terminal")
 
1190
    parser.add_option("--priority", type=u"string", help=u"GnuTLS"
 
1191
                      u" priority string (see GnuTLS documentation)")
 
1192
    parser.add_option("--servicename", type=u"string",
 
1193
                      metavar=u"NAME", help=u"Zeroconf service name")
 
1194
    parser.add_option("--configdir", type=u"string",
 
1195
                      default=u"/etc/mandos", metavar=u"DIR",
 
1196
                      help=u"Directory to search for configuration"
 
1197
                      u" files")
 
1198
    parser.add_option("--no-dbus", action=u"store_false",
 
1199
                      dest=u"use_dbus", help=u"Do not provide D-Bus"
 
1200
                      u" system bus interface")
 
1201
    parser.add_option("--no-ipv6", action=u"store_false",
 
1202
                      dest=u"use_ipv6", help=u"Do not use IPv6")
 
1203
    options = parser.parse_args()[0]
590
1204
    
591
1205
    if options.check:
592
1206
        import doctest
593
1207
        doctest.testmod()
594
1208
        sys.exit()
595
1209
    
596
 
    # Parse the time arguments
597
 
    try:
598
 
        options.timeout = string_to_delta(options.timeout)
599
 
    except ValueError:
600
 
        parser.error("option --timeout: Unparseable time")
601
 
    try:
602
 
        options.interval = string_to_delta(options.interval)
603
 
    except ValueError:
604
 
        parser.error("option --interval: Unparseable time")
605
 
    
606
 
    # Parse config file
607
 
    defaults = { "checker": "fping -q -- %%(fqdn)s" }
608
 
    client_config = ConfigParser.SafeConfigParser(defaults)
609
 
    #client_config.readfp(open("secrets.conf"), "secrets.conf")
610
 
    client_config.read("mandos-clients.conf")
611
 
    
612
 
    # From the Avahi server example code
 
1210
    # Default values for config file for server-global settings
 
1211
    server_defaults = { u"interface": u"",
 
1212
                        u"address": u"",
 
1213
                        u"port": u"",
 
1214
                        u"debug": u"False",
 
1215
                        u"priority":
 
1216
                        u"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
 
1217
                        u"servicename": u"Mandos",
 
1218
                        u"use_dbus": u"True",
 
1219
                        u"use_ipv6": u"True",
 
1220
                        }
 
1221
    
 
1222
    # Parse config file for server-global settings
 
1223
    server_config = configparser.SafeConfigParser(server_defaults)
 
1224
    del server_defaults
 
1225
    server_config.read(os.path.join(options.configdir,
 
1226
                                    u"mandos.conf"))
 
1227
    # Convert the SafeConfigParser object to a dict
 
1228
    server_settings = server_config.defaults()
 
1229
    # Use the appropriate methods on the non-string config options
 
1230
    for option in (u"debug", u"use_dbus", u"use_ipv6"):
 
1231
        server_settings[option] = server_config.getboolean(u"DEFAULT",
 
1232
                                                           option)
 
1233
    if server_settings["port"]:
 
1234
        server_settings["port"] = server_config.getint(u"DEFAULT",
 
1235
                                                       u"port")
 
1236
    del server_config
 
1237
    
 
1238
    # Override the settings from the config file with command line
 
1239
    # options, if set.
 
1240
    for option in (u"interface", u"address", u"port", u"debug",
 
1241
                   u"priority", u"servicename", u"configdir",
 
1242
                   u"use_dbus", u"use_ipv6"):
 
1243
        value = getattr(options, option)
 
1244
        if value is not None:
 
1245
            server_settings[option] = value
 
1246
    del options
 
1247
    # Force all strings to be unicode
 
1248
    for option in server_settings.keys():
 
1249
        if type(server_settings[option]) is str:
 
1250
            server_settings[option] = unicode(server_settings[option])
 
1251
    # Now we have our good server settings in "server_settings"
 
1252
    
 
1253
    ##################################################################
 
1254
    
 
1255
    # For convenience
 
1256
    debug = server_settings[u"debug"]
 
1257
    use_dbus = server_settings[u"use_dbus"]
 
1258
    use_ipv6 = server_settings[u"use_ipv6"]
 
1259
    
 
1260
    if not debug:
 
1261
        syslogger.setLevel(logging.WARNING)
 
1262
        console.setLevel(logging.WARNING)
 
1263
    
 
1264
    if server_settings[u"servicename"] != u"Mandos":
 
1265
        syslogger.setFormatter(logging.Formatter
 
1266
                               (u'Mandos (%s) [%%(process)d]:'
 
1267
                                u' %%(levelname)s: %%(message)s'
 
1268
                                % server_settings[u"servicename"]))
 
1269
    
 
1270
    # Parse config file with clients
 
1271
    client_defaults = { u"timeout": u"1h",
 
1272
                        u"interval": u"5m",
 
1273
                        u"checker": u"fping -q -- %%(host)s",
 
1274
                        u"host": u"",
 
1275
                        }
 
1276
    client_config = configparser.SafeConfigParser(client_defaults)
 
1277
    client_config.read(os.path.join(server_settings[u"configdir"],
 
1278
                                    u"clients.conf"))
 
1279
    
 
1280
    global mandos_dbus_service
 
1281
    mandos_dbus_service = None
 
1282
    
 
1283
    tcp_server = MandosServer((server_settings[u"address"],
 
1284
                               server_settings[u"port"]),
 
1285
                              ClientHandler,
 
1286
                              interface=server_settings[u"interface"],
 
1287
                              use_ipv6=use_ipv6,
 
1288
                              gnutls_priority=
 
1289
                              server_settings[u"priority"],
 
1290
                              use_dbus=use_dbus)
 
1291
    pidfilename = u"/var/run/mandos.pid"
 
1292
    try:
 
1293
        pidfile = open(pidfilename, u"w")
 
1294
    except IOError:
 
1295
        logger.error(u"Could not open file %r", pidfilename)
 
1296
    
 
1297
    try:
 
1298
        uid = pwd.getpwnam(u"_mandos").pw_uid
 
1299
        gid = pwd.getpwnam(u"_mandos").pw_gid
 
1300
    except KeyError:
 
1301
        try:
 
1302
            uid = pwd.getpwnam(u"mandos").pw_uid
 
1303
            gid = pwd.getpwnam(u"mandos").pw_gid
 
1304
        except KeyError:
 
1305
            try:
 
1306
                uid = pwd.getpwnam(u"nobody").pw_uid
 
1307
                gid = pwd.getpwnam(u"nobody").pw_gid
 
1308
            except KeyError:
 
1309
                uid = 65534
 
1310
                gid = 65534
 
1311
    try:
 
1312
        os.setgid(gid)
 
1313
        os.setuid(uid)
 
1314
    except OSError, error:
 
1315
        if error[0] != errno.EPERM:
 
1316
            raise error
 
1317
    
 
1318
    # Enable all possible GnuTLS debugging
 
1319
    if debug:
 
1320
        # "Use a log level over 10 to enable all debugging options."
 
1321
        # - GnuTLS manual
 
1322
        gnutls.library.functions.gnutls_global_set_log_level(11)
 
1323
        
 
1324
        @gnutls.library.types.gnutls_log_func
 
1325
        def debug_gnutls(level, string):
 
1326
            logger.debug(u"GnuTLS: %s", string[:-1])
 
1327
        
 
1328
        (gnutls.library.functions
 
1329
         .gnutls_global_set_log_function(debug_gnutls))
 
1330
    
 
1331
    global main_loop
 
1332
    # From the Avahi example code
613
1333
    DBusGMainLoop(set_as_default=True )
614
1334
    main_loop = gobject.MainLoop()
615
1335
    bus = dbus.SystemBus()
616
 
    server = dbus.Interface(
617
 
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
618
 
            avahi.DBUS_INTERFACE_SERVER )
619
1336
    # End of Avahi example code
 
1337
    if use_dbus:
 
1338
        bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)
 
1339
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
 
1340
    service = AvahiService(name = server_settings[u"servicename"],
 
1341
                           servicetype = u"_mandos._tcp",
 
1342
                           protocol = protocol, bus = bus)
 
1343
    if server_settings["interface"]:
 
1344
        service.interface = (if_nametoindex
 
1345
                             (str(server_settings[u"interface"])))
620
1346
    
621
 
    debug = options.debug
 
1347
    client_class = Client
 
1348
    if use_dbus:
 
1349
        client_class = functools.partial(ClientDBus, bus = bus)
 
1350
    tcp_server.clients.update(set(
 
1351
            client_class(name = section,
 
1352
                         config= dict(client_config.items(section)))
 
1353
            for section in client_config.sections()))
 
1354
    if not tcp_server.clients:
 
1355
        logger.warning(u"No clients defined")
622
1356
    
623
1357
    if debug:
624
 
        console = logging.StreamHandler()
625
 
        # console.setLevel(logging.DEBUG)
626
 
        console.setFormatter(logging.Formatter\
627
 
                             ('%(levelname)s: %(message)s'))
628
 
        logger.addHandler(console)
629
 
        del console
630
 
    
631
 
    clients = Set()
632
 
    def remove_from_clients(client):
633
 
        clients.remove(client)
634
 
        if not clients:
635
 
            logger.debug(u"No clients left, exiting")
636
 
            killme()
637
 
    
638
 
    clients.update(Set(Client(name=section, options=options,
639
 
                              stop_hook = remove_from_clients,
640
 
                              **(dict(client_config\
641
 
                                      .items(section))))
642
 
                       for section in client_config.sections()))
643
 
    
644
 
    if not debug:
645
 
        daemon(False, False)
 
1358
        # Redirect stdin so all checkers get /dev/null
 
1359
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
1360
        os.dup2(null, sys.stdin.fileno())
 
1361
        if null > 2:
 
1362
            os.close(null)
 
1363
    else:
 
1364
        # No console logging
 
1365
        logger.removeHandler(console)
 
1366
        # Close all input and output, do double fork, etc.
 
1367
        daemon()
 
1368
    
 
1369
    try:
 
1370
        with closing(pidfile):
 
1371
            pid = os.getpid()
 
1372
            pidfile.write(str(pid) + "\n")
 
1373
        del pidfile
 
1374
    except IOError:
 
1375
        logger.error(u"Could not write to file %r with PID %d",
 
1376
                     pidfilename, pid)
 
1377
    except NameError:
 
1378
        # "pidfile" was never created
 
1379
        pass
 
1380
    del pidfilename
646
1381
    
647
1382
    def cleanup():
648
1383
        "Cleanup function; run on exit"
649
 
        global group
650
 
        # From the Avahi server example code
651
 
        if not group is None:
652
 
            group.Free()
653
 
            group = None
654
 
        # End of Avahi example code
 
1384
        service.cleanup()
655
1385
        
656
 
        for client in clients:
657
 
            client.stop_hook = None
658
 
            client.stop()
 
1386
        while tcp_server.clients:
 
1387
            client = tcp_server.clients.pop()
 
1388
            client.disable_hook = None
 
1389
            client.disable()
659
1390
    
660
1391
    atexit.register(cleanup)
661
1392
    
662
1393
    if not debug:
663
1394
        signal.signal(signal.SIGINT, signal.SIG_IGN)
664
 
    signal.signal(signal.SIGHUP, lambda signum, frame: killme())
665
 
    signal.signal(signal.SIGTERM, lambda signum, frame: killme())
666
 
    
667
 
    for client in clients:
668
 
        client.start()
669
 
    
670
 
    tcp_server = IPv6_TCPServer((None, options.port),
671
 
                                tcp_handler,
672
 
                                options=options,
673
 
                                clients=clients)
674
 
    # Find out what random port we got
675
 
    servicePort = tcp_server.socket.getsockname()[1]
676
 
    logger.debug(u"Now listening on port %d", servicePort)
677
 
    
678
 
    if options.interface is not None:
679
 
        serviceInterface = if_nametoindex(options.interface)
680
 
    
681
 
    # From the Avahi server example code
682
 
    server.connect_to_signal("StateChanged", server_state_changed)
683
 
    try:
684
 
        server_state_changed(server.GetState())
685
 
    except dbus.exceptions.DBusException, error:
686
 
        logger.critical(u"DBusException: %s", error)
687
 
        killme(1)
688
 
    # End of Avahi example code
689
 
    
690
 
    gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
691
 
                         lambda *args, **kwargs:
692
 
                         tcp_server.handle_request(*args[2:],
693
 
                                                   **kwargs) or True)
694
 
    try:
695
 
        main_loop_started = True
 
1395
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
 
1396
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
 
1397
    
 
1398
    if use_dbus:
 
1399
        class MandosDBusService(dbus.service.Object):
 
1400
            """A D-Bus proxy object"""
 
1401
            def __init__(self):
 
1402
                dbus.service.Object.__init__(self, bus, u"/")
 
1403
            _interface = u"se.bsnet.fukt.Mandos"
 
1404
            
 
1405
            @dbus.service.signal(_interface, signature=u"oa{sv}")
 
1406
            def ClientAdded(self, objpath, properties):
 
1407
                "D-Bus signal"
 
1408
                pass
 
1409
            
 
1410
            @dbus.service.signal(_interface, signature=u"s")
 
1411
            def ClientNotFound(self, fingerprint):
 
1412
                "D-Bus signal"
 
1413
                pass
 
1414
            
 
1415
            @dbus.service.signal(_interface, signature=u"os")
 
1416
            def ClientRemoved(self, objpath, name):
 
1417
                "D-Bus signal"
 
1418
                pass
 
1419
            
 
1420
            @dbus.service.method(_interface, out_signature=u"ao")
 
1421
            def GetAllClients(self):
 
1422
                "D-Bus method"
 
1423
                return dbus.Array(c.dbus_object_path
 
1424
                                  for c in tcp_server.clients)
 
1425
            
 
1426
            @dbus.service.method(_interface,
 
1427
                                 out_signature=u"a{oa{sv}}")
 
1428
            def GetAllClientsWithProperties(self):
 
1429
                "D-Bus method"
 
1430
                return dbus.Dictionary(
 
1431
                    ((c.dbus_object_path, c.GetAllProperties())
 
1432
                     for c in tcp_server.clients),
 
1433
                    signature=u"oa{sv}")
 
1434
            
 
1435
            @dbus.service.method(_interface, in_signature=u"o")
 
1436
            def RemoveClient(self, object_path):
 
1437
                "D-Bus method"
 
1438
                for c in tcp_server.clients:
 
1439
                    if c.dbus_object_path == object_path:
 
1440
                        tcp_server.clients.remove(c)
 
1441
                        c.remove_from_connection()
 
1442
                        # Don't signal anything except ClientRemoved
 
1443
                        c.disable(signal=False)
 
1444
                        # Emit D-Bus signal
 
1445
                        self.ClientRemoved(object_path, c.name)
 
1446
                        return
 
1447
                raise KeyError
 
1448
            
 
1449
            del _interface
 
1450
        
 
1451
        mandos_dbus_service = MandosDBusService()
 
1452
    
 
1453
    for client in tcp_server.clients:
 
1454
        if use_dbus:
 
1455
            # Emit D-Bus signal
 
1456
            mandos_dbus_service.ClientAdded(client.dbus_object_path,
 
1457
                                            client.GetAllProperties())
 
1458
        client.enable()
 
1459
    
 
1460
    tcp_server.enable()
 
1461
    tcp_server.server_activate()
 
1462
    
 
1463
    # Find out what port we got
 
1464
    service.port = tcp_server.socket.getsockname()[1]
 
1465
    if use_ipv6:
 
1466
        logger.info(u"Now listening on address %r, port %d,"
 
1467
                    " flowinfo %d, scope_id %d"
 
1468
                    % tcp_server.socket.getsockname())
 
1469
    else:                       # IPv4
 
1470
        logger.info(u"Now listening on address %r, port %d"
 
1471
                    % tcp_server.socket.getsockname())
 
1472
    
 
1473
    #service.interface = tcp_server.socket.getsockname()[3]
 
1474
    
 
1475
    try:
 
1476
        # From the Avahi example code
 
1477
        try:
 
1478
            service.activate()
 
1479
        except dbus.exceptions.DBusException, error:
 
1480
            logger.critical(u"DBusException: %s", error)
 
1481
            sys.exit(1)
 
1482
        # End of Avahi example code
 
1483
        
 
1484
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
1485
                             lambda *args, **kwargs:
 
1486
                             (tcp_server.handle_request
 
1487
                              (*args[2:], **kwargs) or True))
 
1488
        
 
1489
        logger.debug(u"Starting main loop")
696
1490
        main_loop.run()
 
1491
    except AvahiError, error:
 
1492
        logger.critical(u"AvahiError: %s", error)
 
1493
        sys.exit(1)
697
1494
    except KeyboardInterrupt:
698
1495
        if debug:
699
 
            print
700
 
    
701
 
    sys.exit(exitstatus)
 
1496
            print >> sys.stderr
 
1497
        logger.debug(u"Server received KeyboardInterrupt")
 
1498
    logger.debug(u"Server exiting")
 
1499
 
 
1500
if __name__ == '__main__':
 
1501
    main()